--without-headers and --with-newlib configure options

[booleandomain <booleandomain at gmail dot com>]

Hello,

I have some doubts about the --without-headers and --with-newlib options 
when configuring a cross-compiler.

The only source of informations about these options I'm aware of is 
http://gcc.gnu.org/install/configure.html. There it is written:

--without-headers: Tells GCC not use any target headers from a libc when 
building a cross compiler.
--with-newlib: Specifies that `newlib' is being used as the target C 
library.

In other words --without-headers means not to use any libc headers, 
while --with-newlib means to use newlib headers. So in my opinion 
--without-headers --with-newlib doesn't make any sense. Despite of this, 
I have often seen in the web both options used at the same time. Why?

Thanks.